The MISSOURI RIVER begins near Three Forks and flows north through several reservoirs including Holter, where below its dam, the river becomes a world class trout fishery. From the dam all the way to Cascade, Montana, the Missouri has it all, with opportunities to chase large rainbows and browns on dries, streamers, and nymphs. However, these fish are a combination of smart and spunky, making them a challenge to bring to net. But the Missouri makes for a thrilling day for any angler.